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#include <iostream> #include <vector> #include <algorithm> typedef long long ll; using namespace std; const int INF = 2e9; int main() { ios_base::sync_with_stdio(false); ll n, K; cin >> n >> K; vector<ll> v(n); for(int i = 0; i < n; i++) { cin >> v[i]; } ll L = 0, R = 1e18; ll res = -1; while(L <= R) { ll middle = (L + R) / 2; ll zadaci = 0; for(int i = 0; i < n; i++) { zadaci += middle / v[i]; } if(zadaci >= K) { res = middle; R = middle - 1; } else { L = middle + 1; } } cout << res << endl; return 0; }
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